Micromod RetroPAK: SLC Configuration Manual Instrukcja Użytkownika Pobierz pdf (Strona 107)

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101

Pre-configured Dual Loop PID Control

GENERAL DESCRIPTION

The advanced PID controller function code implements a proportional integral derivative

controller.

This control strategy has two independent loop compounds (SINGLE LOOP

CONTROL 1 and SINGLE LOOP CONTROL 2) each with PID loops with local

setpoint, I/O and other function blocks.

UTILIZATION

Both the loop compounds have the function code compound FC156 – PID. This is PID

with Local SP and uses a PID block, PAD (Process Alarm Display) blocks and a variety

of other blocks to perform a full-pledged PID with PV and Local Setpoint. The PID is

advanced with feed-forward control, bump-less transfers and other features.

Load the loop compound at the top level (where the IF, DIF, SE and ST blocks are

located) of the function block diagram.

The built-in input 1 (AIN1) and built-in output 1 (AOUT1) are used in the first loop and

built-in input 2 (AIN2) and built-in output 2 (AOUT2) are used in the second loop.

Figure P2.1.

Dual loop

PID with Local SP

P2- 1

1 2 ... 102 103 104 105 106 107 108 109 110 111 112 ... 393 394

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